土壤中常见原生矿物组合的定量方法研究

发布时间：2018-08-07 11:38

【摘要】：为了获取适用于土壤中原生矿物的简便、快捷且误差较小的定量分析方法,基于X-射线衍射技术并利用强度比例因子法的基本原理,对钾长石-黑云母-石英组合中三种矿物共存或其中任意两种矿物组合的情形进行了定量研究,建立了9个定量计算公式。对于钾长石-黑云母组合,f%=(If/Ib)/(If/Ib+1.4255)×100%,b%=(Ib/If)/(Ib/If+0.9058)×100%;对于钾长石-石英组合,f%=(If/Iq)/(If/Iq+0.3241)×100%,q%=(Iq/If)/(Iq/If+3.5623)×100%;对于黑云母-石英组合,b%=(Ib/Iq)/(Ib/Iq+0.5590)×100%,q%=(Iq/Ib)/(Iq/Ib+1.8705)×100%;对于钾长石-黑云母-石英组合,f%=If/(If+1.2333Ib+0.5508Iq)×100%,b%=Ib/(Ib+1.1962If+0.4966Iq)×100%,q%=Iq/(Iq+2.7251If+2.5427Ib)×100%。计算结果表明,无论是钾长石还是黑云母和石英,其实测值与真实值之间的相关性均很好:对于黑云母-石英组合,相关系数(r)为0.99;对于钾长石-石英组合和钾长石-黑云母组合,r均为0.96;对于钾长石-黑云母-石英组合,三种矿物实测值与真实值之间的r分别为0.88、0.93和0.92。所建立的方法之误差也较小:对于钾长石-黑云母、钾长石-石英和黑云母-石英组合,平均误差分别为6.9%、5.5%和3.2%;对于三元矿物组合,钾长石、黑云母和石英的平均误差则分别为8.4%、6.5%和6.7%。
[Abstract]:In order to obtain the simple, fast and small quantitative analysis method suitable for the primary mineral in the soil, based on the X- ray diffraction technique and the basic principle of the intensity ratio factor method, the coexistence of three minerals in the combination of the potassium feldspar mica quartz combination or any of the two kinds of mineral assemblages in the combination of the potassium feldspar quartz and quartz is quantitatively studied, and 9 is established. For the combination of potassium feldspar black mica, f%= (If/Ib) / (If/Ib+1.4255) * 100%, b%= (Ib/If) / (Ib/If+0.9058) x 100%; for the combination of potassium feldspar quartz, f%= (If/Iq) / (If/Iq+0.3241) x 100%, q%= (Iq/If) / (Iq/If+3.5623) * 100%; for the black mica quartz combination. 100%, for the combination of potassium feldspar - mica quartz, f%=If/ (If+1.2333Ib+0.5508Iq) x 100%, b%=Ib/ (Ib+1.1962If+0.4966Iq) x 100%, q%=Iq/ (Iq+2.7251If+2.5427Ib) x 100%., the results show that the correlation between the true value and the true value is good both in potassium feldspar and black mica and quartz: for the combination of black mica quartz and correlation The coefficient (R) is 0.99; for the combination of potassium feldspar quartz and potassium feldspar mica, R is 0.96; for the combination of potash feldspar quartz and quartz, the error between the measured values of three minerals and the true values of the R is 0.88,0.93 and 0.92., respectively: for the combination of potassium feldspar mica, potassium feldspar quartz and biotite quartz, The average errors are 6.9%, 5.5% and 3.2% respectively, and 8.4%, 6.5% and 6.7% for K-feldspar, biotite and quartz respectively.
【作者单位】：南京农业大学资源与环境科学学院;
【基金】：国家自然科学基金项目(40573057) 中国科学院黄土与第四纪地质国家重点实验室开放课题(SKLLQG1511)联合资助
【分类号】：S153.6

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